<table>
    <tr>
      <th>标题1</th>
      <th>标题2</th>
      <th>标题3</th>
    </tr>
   <tr>
      <td rowspan="2">合并的单元格</td>
      <td>单元格2</td>
      <td>单元格3</td>
    </tr>
    <tr>
      <td colspan="2">合并的单元格</td>
    </tr>
    <tr>
      <td>单元格4</td>
      <td>单元格5</td>
      <td>单元格6</td>
    </tr>
  </table>